Spectra: Spectroscopy indicating that ASASSN-17mt is a classical nova in the optically thick (Fe-curtain) stage was obtained 2017 September 28.77 UT by P. Luckas (International Centre for Radio Astronomy Research, Univ. of Western Australia; ARAS Group; ATel #10795).

Observing recommendations: Observations of all types (visual, CCD, DSLR, spectroscopy) and multiple bands as instrumentation permits are strongly encouraged as the nova evolves.

K.-L. Li et al. (Michigan State University) report a likely Fermi-LAT detection of ASASSN-17mt (ATel #10977), and have secured weekly observations with Swift for the next ten weeks. Additional multiwavelength observations may also take place. Increased and continuing optical coverage is essential, with V and I bands the highest priority. Visual observations are welcome.

Charts: Finder charts with a comparison star sequence for ASASSN-17mt may be created using the AAVSO Variable Star Plotter (VSP).

Submit observations: Please submit observations to the AAVSO International Database using the name ASASSN-17mt. Once a GCVS name is announced in an IAU Circular or CBET, please use that name.

Notes:
a. Designated ASASSN-17mt in the course of the ASAS-SN survey. Unless otherwise noted and except for observations reported to the AAVSO, the information in this Alert Notice is taken from ATels #10772, #10774, #10785, and #10795, and #10977.

b. Stanek et al. report that there was an ~80-day seasonal gap in the ASAS-SN coverage before the observations given above, so the nova could have peaked already. Nothing is seen down to <16.9 V at the location of the nova in subtracted images taken on UT 2017-07-07.95 and before. They also report that nothing had been detected since ASAS-SN began observing the location in February 2016.